Quote Originally Posted by Euphoric
Crystals have their own particular vibration of a precise and measurable intensity. This vibration attunes itself to human vibration better than any other gem or mineral. Quartz crystal is used to amplify, clarify and store energy. When you create a thought, you can amplify and clarify it by using a crystal. Quartz has long been recognized for its ability to produce electrical impulses. (Pressure on quartz crystal generates a minute electrical charge called piezoelectricity.)
Well, the only part they got right was the bit about piezoelectricity. The converse is also true: a voltage applied across a quartz crystal will cause it to distort. This is how the tiny transducers that make the BEEP sound in digital watches and other small electronic devices works.